21106550007 has 12 divisors (see below), whose sum is σ = 32091830680. Its totient is φ = 13330452528.

The previous prime is 21106549999. The next prime is 21106550021. The reversal of 21106550007 is 70005560112.

21106550007 is a `hidden beast` number, since 2 + 1 + 1 + 0 + 655 + 0 + 0 + 0 + 7 = 666.

It is not a de Polignac number, because 21106550007 - 2³ = 21106549999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106550207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61714888 + ... + 61715229.

Almost surely, 2^21106550007 is an apocalyptic number.

21106550007 is a deficient number, since it is larger than the sum of its proper divisors (10985280673).

21106550007 is a wasteful number, since it uses less digits than its factorization.

21106550007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123430142 (or 123430139 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The spelling of 21106550007 in words is "twenty-one billion, one hundred six million, five hundred fifty thousand, seven".